Drill-chuck



R. E. WILGOX. Drill-Chuck.

No. 225,902 Patented Mar. 23,1880.

. WITNESSES:

ATTORNEYS.

UNITED STATES PATENT OFFICE.

RICHARD E. WILCOX, OF HARTFORD, CONNECTICUT.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 225,902, dated March 23, 1880.

Application filed September 29, 1879.

To all whom it may concern:

Be it known that 1, RICHARD ELDRED WIL- GOX, of Hart-ford, in the county of Hartford and State of Connecticut, have invented a new and Improved Drill-Chuck, of which the following is a specification.

Figure 1 is a sectional elevation of my improved chuck, taken through the lineman, Fig. 2. Fig. 2 is a front elevation of the chuck, the cap being removed. Fig. 3 is a front elevation of the chuck. Fig. 4. is a sectional elevation taken through the line 3 y, Fig. 1, the jaws being removed. Fig. 5 is a front elevation of one of the jaws. Fig. 6 is a side elevation of two of the jaws, showing their relative positions.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish improved drill-chucks so constructed as to hold the work firmly and allow it to be easily inserted and removed. The work is held by the front ends of the jaws, which. are made to open or close by turning the exterior case of the chuck, as will be hereinafter set forth.

A represents the stem or shank of the chuck. Upon the forward end of the stem A is formed, or to it is attached, a head, B, cylindrical in form, and with its forward end beveled, as shown in Fig. 1.

In the head B are bored an axial hole, 0, and three inclined holes, D. The three'holes D are equally distant from each other, and have exactly the same inclination, so that their center lines would meet the center line of the hole C at the same point.

The space between the holes D and the axial hole C is cut out to receive the wings E of the jaws F. The jaws F are made cylindrical to fit into the inclined holes of the head B, and their wings E are made triangular, so that their edges may be parallel to and rest squarely against the object to be held. The edges of the wings E are beveled upon both sides, as shown in Fig. 2.

The forward ends of the jaws F are so beveled that their faces may be at right angles with the axis of the chuck. The inner ends of the jaws F are so beveled as to be parallel with their forward ends, and the said inner ends are also beveled upon their outer sides, so as to be parallel with theinner walls of the case G.

The case G is made cylindrical, and with a screw-hole in its base to fit upon screwthreads out upon the stem A at the base of the head B. The cavity of the case G is made of such a size as to receive and fit upon the head B, and upon the bottom wall of the said cavity is placed a ring-plate, H, for the inner ends of the jaws F to rest against.

In the inner surface of the forward end of the case G is cut a screw-thread to receive a screw-thread out upon the outer surface of the cap I. The cap I has a hole, J, formed through its center, in line with the hole 0 of the head B, through which hole the object to be held is inserted. The cap Irests against the forward ends of the jaws F, and is designed to push the jaws F back to spread them and allow the object to be held to be readily inserted and removed. The outer surface of the case G is milled, so that it can be readily turned to expand and contract the jaws.

With this construction, by turning the case G back upon the stem A the cap I will press the jaws F back, expanding them, so that the object to be held can be inserted between the edges of their wings E, and by turning the case G forward the ring-plate H will press the jaws Fforward, contracting them and forcing the edges of their wings E squarely against the object to be held, so that they will grasp and hold it firmly. When the edges of the wings E grasp the object to be held the ringplateH will stop turning, and a slight further turn of the case G will tighten up the various parts of the chuck and hold the jaws firmly in place.

I am aware that chuck-bodies have heretofore been provided with inclined converging perforations to receive cylindrical jaws, and that said jaws, provided with screw-threads, have been operated therein by a conical nut.

I am also aware that chucks have been constructed with inclined ways which receive the jaws, the jaws being closed by a screw-cap which forces them inward, and opened when the cap is withdrawn by a thimble forced outward by a spring.

I am also aware that jaws have been opened and closed in chucks provided with inclined converging grooves by the movements of a screw-cap surrounding the chuck-head, said cap being provided with a iace-plate, to which the jaws are attached at their forward ends; and I am also aware that a chuck has been constructed which is provided with jaws that are operated by being forced against inclines on the inner surface of the head.

What I claim as new and of my invention 1s The combination of the threaded stem A, 15 the head B, having holes 0 D, the winged jaws E F, the case G, threaded to receive said stem, the plate H, and the screw-cap I, having hole J, all constructed and arranged substantially as shown and described.

RICHARD E. WILOOX. Witnesses:

S. A. GALPIN, GEORGE F. BARKLEY. 

